1) Do not cross post - either post here or e-mail me but not both. It's a pain to have to respond to both.
2) Your problem arises because you deleted that from public_topic_page.pl from preventing Member Numbers being displayed. Doing that is your own choice but you'll have tons of problems later on if you're hit by a spammer.
3) The solution to your problem is to put $this_img where you feel it's appropriate. If you look in the original distribution of public_topic_page.pl, you'll find where that $member_number is and from there putting $this_img should be obvious.
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